工业层燃炉Urea-SNCR的数值模拟研究  

Numerical simulation study of Urea-SNCR in industrial layer burning boiler

作　　者：王志[1,2] 王夫美 沈伯雄 高洪培[3] 姚燕[4] 梁材[5] WANG Zhi;WANG Fumei;SHEN Boxiong;GAO Hongpei;YAO Yan;LIANG Cai(Tianjin Key Laboratory of Clean Energy and Pollution Control,Hebei University of Technology,Tianjin 300401,China;School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300401,China;China Huaneng Group Clean Energy Technology Research Institute Co.,Ltd,Beijing 102209,China;Suzhou West Thermal Energy Saving and Environmental Protection Technology Co.,Ltd,Suzhou,Jiangsu 215010,China;Chengdu Eastern Kateri Environmental Catalyst Co.,Ltd,Chengdu,Sichuan 610042,China)

机构地区：[1]河北工业大学天津市清洁能源利用与污染物控制重点实验室,天津300401 [2]河北工业大学能源与环境工程学院,天津300401 [3]中国华能集团清洁能源技术研究院有限公司,北京102209 [4]苏州西热节能环保技术有限公司,江苏苏州215010 [5]成都东方凯特瑞环保催化剂有责任公司,四川成都610042

出　　处：《河北工业大学学报》2020年第5期64-72,共9页Journal of Hebei University of Technology

基　　金：天津市生态环境治理科技重大专项(18ZXSZSF00040);河北省教育厅重点项目(ZD2019065)。

摘　　要：工业锅炉普遍应用于多种行业的生产实践,其氮氧化物的排放是我国大气氮氧化物污染的重要来源之一。随着大气污染排放标准的提高,Urea-SNCR技术成为工业锅炉脱硝的主流技术之一。Urea-SNCR系统的脱硝效率,与烟道内部构件、喷氨系统、运行参数、烟气流动条件及氨和烟气的均质混合等多种因素相关。本文针对某90 t/h层燃炉的二次燃烧室进行SNCR数值模拟,研究喷射位置、喷枪数量、氨氮比(NSR)、喷射速度及还原剂颗粒粒径等因素对SNCR脱硝效率的影响及其影响规律。结合响应面法,进行SNCR系统布置最优设计,得出在喷枪数为10个、还原剂喷射高度在3 m、NSR=2、喷射速度为82 m/s和颗粒粒径为60μm时,脱硝效率最高为30%。研究成果有助于工业用层燃炉SNCR脱硝系统的改造和优化。Industrial boilers are widely used in various industries.The nitrogen oxides generated from industrial boilers is an important source of atmospheric nitrogen oxides pollution in China.With the improvement of air pollution emission standard,Urea-SNCR technology became one of the mainstream denitrification technologies for industrial boilers.Howev⁃er,the denitrification efficiency of SNCR system is driven by various factors,including its internals,ammonia injection system,operation parameters,flue gas flow conditions,and homogeneous mixing of ammonia and flue gas.In this paper,SNCR numerical simulation was carried out for the secondary combustion chamber of a 90 t/h layer burning burner.The influence and optimal design of SNCR system were carried out based on the factors affecting SNCR denitration efficien⁃cy,such as injection location,number of spray guns,ammonia nitrogen ratio,injection speed and reducing agent particle size.Based on the response surface method,the maximum denitration efficiency was 30%when the number of spray guns was 10,the height of reducing agent injection was 3 m,NSR=2,the injection speed was 82 m/s and the particle size was 60μm.The research results are helpful to the transformation and optimization of SNCR denitration system for industrial layer burner.

关 键 词：层燃炉 SNCR 数值模拟 氮氧化物 最优设计 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程] X701[环境科学与工程—环境工程]